<template>
  <div>
    <div v-show= "flag">全场清仓，全部5折</div>


     <ul>
        <li v-for= "item in goods" :key= "item.name">
            <div>{{item.name}}</div>
            <div>{{item.price}}</div>
            <div>折扣：{{item.discount*100}}% </div>
        </li>
     </ul>

     <button @click= "btn">点击显示促销</button>
   </div>
</template>
 
<script>
export default {

  data() {
    return {
        goods:[
            {
                name:'mac电脑',
                price:'15000',
                discount:1
            },
            {
                name:'百事可乐',
                price:'3',
                discount:1
            },
            {
                name:'保温杯',
                price:'99',
                discount:1
            },
            {
                name:'保暖手套',
                price:'130',
                discount:1
            },
        ],
        flag: false
    };
  },
  computed: {

  },

  methods: {
    btn() {
      this.flag = !this.falg
      return this.goods.forEach(item => {
        return ( item.price = item.price*0.5, item.discount = 0.5)
      })
    }
  }
};
</script>

<style scoped>
ul {
    margin: 0;
    padding: 0;
}

li {
    list-style: none;
    width: 200px;
    height: 80px;
    padding:10px 0 0 0 ;
    border: 2px solid #333;
}
</style>